Recently I won this watch in an auction. It was described as from about 1970, obviously the seller did not know a lot about watches. The movement is an IWC cal. 75, 10´´, which was the first wrist watch movement produced by IWC. The cal. 75 was intended for women´s watches in round cases and for men in square cases. The case bears the Cresarrow trademark and was made by Henry Blank & Co., USA. In 1912 Henry Blank had journeyed to Europe to conduct dealings with IWC, among others. He returned to the USA on board of the Titanic and survived. His firm was a supplier to Tiffany, including watches. These historical details match the date of the movement. The movement has the IWC trademarks and is of the highest grad. It has an overcoil hairspring, 19 jewels, and is regulated in 6 positions. The import of this movement into the USA must have been rather expensive. The case is in 18K gold, really heavy and of exquisite quality. This item seems to be really rare pioneer of early wrist watches Here are few sellers photos, the movement photo really fuzzy. Would you have recognized? It was a positive surprise to see the movement being of highest finishing grade. Good movement photos of both movement sides are to follow.